package com.daichi.security;

import cn.hutool.core.util.StrUtil;
import com.daichi.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class JwtAuthenticationFilter extends BasicAuthenticationFilter {

    @Autowired
    private JwtUtils jwtUtils;

    @Autowired
    private UserDetailServiceImpl userDetailsService;

    public JwtAuthenticationFilter(AuthenticationManager authenticationManager) {
        super(authenticationManager);
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {

        String jwt = request.getHeader(jwtUtils.getHeader());

        if (!StrUtil.isBlankOrUndefined(jwt)) {
            Claims claim = jwtUtils.getClaimByToken(jwt);
            if (claim == null) {
                throw new JwtException("token异常");
            }
            if (jwtUtils.isTokenExpired(claim)) {
                throw new JwtException("token已过期");
            }

            String username = claim.getSubject();

            UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(username, null, userDetailsService.getUserAuthority(username));

            SecurityContextHolder.getContext().setAuthentication(token);
        }

        chain.doFilter(request, response);

    }
}
